There's 3 seperate steps that need to be done for choke tubes. First the choke has to be reamed away,then the barrel has to be reaned for the choke tubes,and finally the barrel has to be threaded for the tubes)whatever type you choose). I usually charge from $80-100 for the above processes however I think that I might be on low side because I havn't raised my charges for this type of work in years. And NO I;m NOT trying to get business on this forum.